CZ1 is a socket (the pinyin initials of the socket are like this in many domestic labels. If you don’t know what it is in the future, you can try to spell it)!

1 is connected to the negative pole of the power supply, 2 and 3 are connected to the two channel outputs (you can also connect them together to connect one channel output), and 4 is connected to the 9V positive pole. There are very few replaceable varieties of this chip because it is a dedicated chip. This is also very easy to buy, only 2 yuan a piece. Just buy a few pieces, why replace them?

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